Aeration shield for burners of gas ranges



Nov. 24, 1931. 1. v. BRUMBAUGH 1, 3

AERATION SHIELD FOR BURNERS OF GAS RANGES Fild July 15. 1929 4 Sheets-Sheet 1 Nov. 24, 1931. v. BRUMBAUGH ,734-

AERATION SHIELD FOR BURNERS 0F GAS RANGES Filed July 15. 1929 4 Sheets-Sheet 2 Nov. 24, 1931. I. v. BRUMBAUGH AERATION SHIELD FOR BURNERS OF GAS RANGES Filed July 15. 1929 4 Sheets-Sheet 5 Noin 24, 1931. I.V.BRUMBAUGH 33, 4

AERATION SHIELD FOR BURNERS OF GAS RANGES Fil ed July 15. 1929 4sheets si1eet 4 Patented Nov. 24, 1931 v UNITED STATES PATENT OFFICE ISAAC VERNON BRUMBAUGH, OF ST. LOUIS, MISSOURI, .ASSIGNOR '1'0 AMERICAN STOVE I COMPANY, OF ST. LOUIS, MISSOURI,

A. CORPORATION OF NEW JERSEY AERATION SHIELD FOR BURNEBS OF GAS RANGES Application filed July 15,

ciation has written certain specifications and requirements in the operation of what is known as closed cooking top ranges or stoves.

Among these specifications it is required that the combustion must be practically perfect as only about 0.078% of carbon monoxide is allowed in the air-free products of combustion, and this same association has required that the cooking top burners of gas ranges must have an efiiciency not less than 30%.

It is the primary object of this present improvement toprovide a closed cooking top utilizing gas burners that have not only the eificiency required by the association but even greater efficiency, and that so perfect acomv -bustion is provided that the specification of the association in respect to carbon monoxide is complied with.

The present invention relates to a closed cooking top that contains a plurality of front burners (usually two) and a plurality of rear burners (usually two) and that all of the burners are of substantially the same size and all of them are contained beneath the said cooking top.

The inventor of the improvement here involved has spent a great deal of time in experimenting and working out a closed cooking top that will comply with the requirements of the American Gas Association, and has finally succeeded in producing aconstruction that is well within the said requirements. I

Speaking in general terms the requirements have been worked out byrforming a compartment that is substantially closed along its front and both sides the compartment having its horizontal wall consisting 1929. Serial No. 378,434.

dividual collars each collar embracing one burner, or the equivalent of the collar, the burner openings located between the upper edge of the collar and the said horizontal Shield.

'After long experimentation and tests. it was ascertained that in a closed cooking top of the type described and containing front and rear burners that the rear burners received an excessive flow of secondary air, as compared with the secondary air supplied to the front burners, and it became necessary to work out some means whereby the proper amount of secondary air would be supplled to the rear burners and at the same time the proper amount of secondary air be supplied to the front burners. The manner in which this has been done in the present improvement broadly consists in an arrangement whereby all of the burners obtain their -sec-' ondary air from a common chamber or supply and it was found by utilizing in this combination, means supplied to the rear burners for restricting the supply of secondary air to them that the required thermal efliciency of the front and rear burners was provided,

and thattherefore I had produced a combination which would meet .the requirements of the said association.

I also found that the efliciency of the present invention was very much improved by providing the rear wall of the combustion.

compartment with a restricted outlet or out- I lets for the products of combustion to the flue. The'previously described arrangement greatly increased the thermal efliciency of the burners and thisefliciency was found to be further increased by having the rear wall closed at points substantially opposite the rear burners and to provide the outlet for the products of combustion in a line substantially at the sides of the rear burner.

' Additional advantages, operations and improvements will be described hereinafter.

In the drawings;

Figure 1 is a top plan view of the top burner construction involving the present improvement with the removable top or lid portion omitted. a

Figure 2 is a frontview of Figure 1. Figure 3 is a,cross section on the line 3 -3 of Figure 1 with the removable top or lid portion in position.

Figure 4 is a longltudinal vertical sectional view on the line 4-4 of Figure 1. i

- Figure is a to plan view of the top of the aeration shield Figure 6 is a transverse vertical sectional view on the line 6-6 of Figure 5;

Figure? is an enlarged'vertlcal sectional view through one .of the rear burners embracing collars the same being shown in enlarged sectional view. t

Figure 8 is a vertical transverse sectional ,view on the line 8'8 of Figure 1 showing a portion of one of the front collars and one of 2o the supporting elements of the aeration shleld.

Referring now to the drawings in this case and particularly to Figures 1 and 2, the surroundin edge or frame 1 of the top burner 2a portion is shown. The removable top members 2 are shown in Figure 3. Below these removable members is located what I term an aeration shield 3. This aeration shield primarilyconsists of a horizontal portion. 1

Projecting upwardly from the surrounding edges of this shield 3 is a vertical wall 4 which extends substantially to the under side of the removableportion 2 of the top of the range;

v .This vertical wall '4 extends upward and rear burners 10 and 11.

consists essentially of the horizontal wall serves substantially as a closure for the shield 3 with the exception that the said wall is removed at the rear of the said shield as at the central point 5 and the two end points 6 and 7.

The objeetand operations of these openings -will be described hereinafter.

Surrounding the front burners 8 and the 9 are vertically arranged walls This aeration shield therefore portion 3, the peripheral wall portion 4 and .the vertically arranged portions 10 and 11 surrounding thesaid burners. The forming in the rear end of this aeration shield of the passageways. 5, 6 and 7 leaves a vertically arranged portion 12 which lies between the said openings and the upper edges of these parts12 extend outwardly as shown at 13 resting-upon an inwardly extending ledge. 14

of the surrounding frame 1 while the-front 5, 6 and 7 to the'flue box 17 from which box the products pass outward through the flue 21. h i T By reference to Figure 1 it will be observed that I have provided means for restricting the flow of the secondary air to the rear burn.

ers 9 and that this means consists of the projecti'ons 22 located between the arms of the burners, there being a space surrounding these projecting arms and theadjacent wall of the radially extending fingers of the burners. These air restricting members serve a very important function in'this improvement as will presently appear.

The lighter burner 23 is of the usual construction and the flames therefrom pass through the openings24 and into time enings 25 formed in the surrounding mem ers 10 and'11 to the gas flowing from the burners 8 and 9 for lightingthem.

By reference to Figure 4 it will be observed that the manifolds 26 of the said front burners 8, and 2701? said rear burners 9- are located Y under the aeration shield 3 and that the shutter portion 28 of the front ends of these manifolds. .are also located outside of the said aeration shield. A suitable gas manifold 29 is here shown as located under the front edge of the frame 1 and connected with this manifold are the gas valve housings 30 and suitable handles-31 operate the gas valves (not shown) 'locatedin the housipgs 30. It will also be observed that this arrangement brings I the mixing tubes. ormanifolds entirely outside of the;aeration shield for a purpose-to be presently explained in connection with the operation of this improvement. A gas supply 32 for the pilot light 23 is also provided and receives itsgas in the ordinary way for lighting the mainburners, and is also outside of said shield.

Located under the burners 8 and 9 is the ordinary removable tray portion 33Handthis tray portion forms a chamber 34 that isopen at its outer end, though the front end of this I chamber may be closed without aifecting my present improvement so long as suflicient air flows thereby to supply the wants of the burners.

'From the foregoing description it will be observed that the front and rear burners 8 and 9 all communicate with a single common chamber 20. With jagas ran e having such aconstruction it was a prob em to rovide means whereby the'front and rear urners would receive the same amount of secondary air because it was found in such a construction that the rear .burners receive such an excess supply of secondary air as to make them wholly inefiicient and to make them wholly 1'2 unable to meet the American Gas Association.

Inthe above combination I foundthat both' the front and rear burners would be supplied with the proper amount of second the efliciency requirements of ary air by providing the rear burners with air thereto and I met this problem by providing the aeration shield having vertical collars surrounding the burners and all of the burners communicating with a common compartment or chamber and by providing the rear burners with the restrictlon, and specifically the restriction here shown consists in having radially inwardly extend ing members 22 that extend between the arms of the burners, the said arms leaving suflicient space to provide the proper amount of secondary air. Although the-front and rear urners received their secondary air from a common chamber I found that the rear burners received an excess of secondary air and I found that I could cutdown the excess amount of secondary air supplied to the rear burners by providing them with a restricting means and that this was very much improved by. restricting the flow of the products of combustion from the chamber or compartment 2. by such means, for instance as the restrictions 5, 6 and 7 or any restriction that was equivalent thereto.

-It may be that the excess amount of secondary air to the rear burners while there is no excess air to the-front burners is caused by reason of the draft caused by the front burners and that this draft was added to the draft of'the rear burners, thereby supplying an excessive draft to the rear burners and thereby an excessive amount of secondary air thereto. At any rate, I have succeeded in combining the front and rear burners in a common chamber to which the-combustion of both burners is fed and at the same time I have been enabled to control the amount of secondary air to the rear burners. Of course it is not new to take a single burner and provide it with some restricting means very much like that shown in this application, but it is new so far as I amaware to combine the front and rear burners and to control the amount of secondary air fed to the rear burners while allowing the ordinary amount of secondary air to be fed to the front burners, and yet the front burners not receiving an over supply of this secondary air.,

It is of course understood that primary air fed to gas burners is that air which passes in the burner manifold and mixes with the gas thereby providing the ordinary blue flame, while secondary air is the air that is supplied to the flame outside and independently of the manifold.

The mixing tubes or manifolds 26 and 27 are located below the aeration shield 3 which is for the purpose of preventing the overheating of the mixing tubes because the products of combustion do not come in direct contact with them.

I have found that the distance between the top 2 and the burner as indicated by X in Figure 3 must be considerably less than the distance between the said top 2 and the aeration shield 3 as indicated bythe dotted line Y in Figure 2, in order to obtain the best results in the practice of this improvement. v

I also find that the collars 10 and 11 should extend above the to of the burner substantially as far as the urner extends above the aeration shield 3 in order to serve to direct the secondary air to the burner flames and also serve to prevent the burned gases which have been formed from being circulated back to the burner flames, that is to say, an aeration shield without these collars the secondary air would not be directed to the burner flames properly, and unsatisfactory combustion would occur because some of the burned gases would return to the flames.

I have been led to the conception of this present invention by reason of the requirements of the American Gas Association, and I have only been enabled to accomplish the above results after long study and experimentation.

It will be noted that the pilot light construction extends into what I will designate as the combustion chamber 20 and that the ports 24- for this pilot light are above the base of the aeration shield and that the tube 32 that supplies gas to the pilot light is below the base of the aeration shield.

Th space between the collars 10 and 11 and the lid or top portion 2 is in reality a restriction which provides only suflicient space for the flame and the passage of the burned ases. g While numerous efforts have been made to accomplish the purposes above described, yet so far as am aware I amthe first to accomplish these objects through the means herein described.

I desire it understood that variations may be made in the construction and arrangement of the invention without departing from the scope of the invention so long as such changes will come within a liberal interperation of the attached claims.

Having thus described my invention what I claim and desire to secure by Letters Patent is:

1. In a range the combination of a substantially closed burner top, an aeration shield located below and separated from the said top thereby forming a combustion chamber, front and rear burners located therein,

,secondary air restrictions for said burners,

' set forth.

2. In a range the combination of a substantially closed burner top, an aeration shield lcitbd helow and separated froni said top thereby foririing'a; combustion chamber, front aJhErear-burners located therein, said burners h aviilg seoondary a11- restrictions thereai-oundf'the "s'a'id surrounding secondary air restrictions for the rear burners being greater than for the front burners, whereby excessivefiow' (if sebondary air to the rear burners is' prevented and the proper flow of secondary air 'tti'hoth the'front and rear burners to fxriaixitziin fan e'flicient' burning of. both front and refir'b'urn ers isaccomplished.

te s'tiinoliy whereof I hereunto 'afix my Si'gfia'ttrJ" ISAAG V jERNGN BBUM'BAUGH. 

